Attachment for printing-presses.



J. G. ROBERTSON.

ATTACHMENT FOR PRINTING PRESSES.

APPLICATION FILED DEC. 7, 1911.

Patented 0013. 14, 1913.

2 SHEETS-SHEET 1 J. G. ROBERTSON.

ATTACHMENT FOR PRINTING PRESSES.

APPLICATION FILED DEC. 7, 1911. 1,075,67Q, Patented 060.14, 1913.

2 SHEETS-SHEET 2.

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JAMES G. ROBERTSON, OF ST. LOUIS, MISSOURI.

ATTACHMENT FOB PRINTING-PRESSES.

Specification of Letters Patent.

Patented (lot. is, 1913.

Application filed. December 7, 1911. Serial No. 664,346.

To all whom it may concern Be it known that I, Janus G. Ronnn'rsoN, a citizen of the United States of America, and a resident of the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Attachments for Printing-Presses, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

The objects of my invention are to furnish printing presses with printing attachments providing for the performance of supplemental printing or overprinting upon printed surfaces, and to so perform the supplemental printing operations as to provi .e for the primary impressions being viewed hrough the supplemental impressions. In this connection, one of the main purposes of my improvement is to provide for the 1mpression over initially printed obyects of impressions in prominent type pertainlng to dates, or other matter important in determination of the value of the objects. In this connection, the printing operations more particularly in view relate to those involved in the production of tickets, such as street railway, or other transportation transfers, the value of which is governed by time limits.

Figure I is a top or plan view, partly broken out, illustrating my printing press attachment. Fig. II is an elevation of a portion of the attachment broken out to show parts in section. Fig. III is a cross section taken on line III-III, Fig. I. Fig. IV is a diagrammatic view illustrating my at tachment as used in combination with a form cylinder and an impression cylinder of a printing press. Fig. V is a view of a street railway transfer ticket as it appears when printed in the use of my improvement.

In the drawings: I have shown my improvement combined with a form cylinder A, and an impression cylinder B of a printing press, between which a web of paper is passed to first receive an impression from the form of the form cylinder and then receive an impression from my attachments.

My attachments are herein shown incorporated in a numbering device, cooperable with the form and impression cylinders A and B and comprising numbering heads C secured at suitable intervals to circular carriers D on a shaft E, the said shaft being also provided with bearers F.

Any desired number of my attachments may be utilized in a numbering device in which they are incorporated, the attachment being placed intermediate of the lon gitudinal rows of numbering heads C.

Inasmuch as the attachments are all similar in construction, I will describe only one of them in detail.

The attachment includes a segmental bed G that is secured to the bearers F by suitable clamp members H, and extends from end to end of the numbering device. At intervals upon the bed G are seats for curved electrotype or other printing plates I, that occupy positions between circular series of the numbering heads C.

In the bed G of the attachment are longitudinal grooves 1 and 2 extending substantially. throughout the length of the bed and serve as guideways for printing plate holding members about to be more particularly referred to. The printing plates I are held at their ends by plate holders 3 which occupy transverse inverted 'T-grooves 4 in the bed at the location of the printing plate seats, as seen in Fig. II, the holders coinprising lower inverted T-sections in the undercut portions of the T-grooves and upper plate engaging T-sections being united to the lower sections by draw screws 5.

6 and 7 designate plate holder setting screws extending longitudinally in the bed grooves 1 and 2, respectively, and having unthreaded ends loosely mounted in the end portions of the bed. These setting screws are provided with heads 6 and 7 to which screw drivers, or any other suitable implement may be applied for the purpose of rotating the screws to adjust the plate holders, and at the other ends of the screws are collars 6 and 7 that serve to prevent longitudinal movement of the screws in one direction, movement in the opposite direction being prevented by the heads of the screws.

8 and 9 designate slidable printing plate holders arranged respectively in the longitudinal grooves 1 and 2 of the bed Gr. These plate holders are non-circular in shape to prevent their turning in the grooves in which they operate. The holders 8 are traversed by the setting screw 6 which has screw threaded engagement therewith, and the holders 9 are traversed by the setting screw 7 which has screw threaded engagement with the last named.

From the foregoing description, it' will be readily understood that the printing plates I may be quickly and efiiciently secured to their seats upon the bed G and adjusted to their proper positions between the numbering heads C through the medium of the plate holders 8 and 9 and the setting screws 6 and 7. In mounting the printing plates upon the seats provided therefor the plates are first laid on the seats and loosely engaged by the plate holders 3 that are to hold their ends. Then, by rotating the setting screws 6 and 7 to the requisite degrees, the entire series of plate holders 8 are moved in one direction and the entire series of plate holders 9 are moved in the opposite direction, the printing plates are adjusted to their proper positions longitudinally of the attachment and clamped between said holders. When the adjustment of the printing plates has been acquired, the plate holders 3 are tightened to the ends of the printing plates, and the attachment is ready for use.

My attachments are supplied With ink from a suitable inking device such as a roller 10 independently of the supply of ink furnished to the printing press form cylinder A by an inking device such as the inking roller 11. The ink supplied from the roller 10 is preferably a transparent ink and, therefore, when printing operations are performed by my attachment upon a sheet of paper, after a first impression has been made thereon by the form cylinder, the impression from my attachment will be plainly visible on the printed surface and the matter initially printed may be viewed therethrough.

While my attachments are preferably in corporated in a numbering device, as herein shown and described, it is obvious that the numbering heads C may be dispensed with and the attachments be secured alone to rotatable bearers cooperable with the form and impression cylinders of a printing press.

I claim An attachment, comprising a shaft, carriers fixed to the shaft, bearers also fixed to the shaft, a segmental bed, mounted on the carriers, having longitudinal grooves and transverse inverted T-grooves, and provided with clamp members secured to the bearers, slidable plate holders in' the longitudinal grooves, setting screws working in the plate holders, and end plate holders consisting of lower inverted T-sections, upper T-sections,

and draw screws.

J. G. ROBERTSON. In the presence of A. J. MoCAnLnY, E. B. LINN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

